<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
   <meta name="viewport" content="width=device-width, initial-scale=1.0">
   <title>Document</title>
<script src="/CHENG-ZAO-ZAO/js/vue.js"></script>
</head>
<body>
     <div id="app">
       <p>{{msg}}</p >
     </div>
<br>
   <script>
       var vm =new Vue({
        el:"#app", 
        data:{
            val:"简单对象初始值",
            obj:{
                name:"复杂对象name",
                value:"复杂对象value",
            }
        },
        watch:{
            val:function(newval,oldval){
                console.log(newval,oldval);
                console.log(this.val);
            },
            obj:{
                deep:true,
                handler:function(new_val,old_val){
                    console.log(new_val,old_val);
                }
            }
        }
       })
    </script>
</body>
</html>